If you’re excited about picking up a Galaxy S4 soon, make sure you either have a micro SD card handy or you buy one with upgraded storage.

When a product’s packaging tells you that you’re going to get a certain amount of storage there’s an expectation that it will deliver something close to that amount for you to use. With Android phones, it’s common to simply not warn buyers that the available storage is partially used by the system and pre-loaded apps. If built-in storage is a big deal to you, the 16GB Samsung Galaxy S4 may not be your best choice.

If you head to the Storage section of the Settings on a new Galaxy S4, you’ll find that only 8.82GB is available to the user. That’s the total space available to you, so applications that were pre-loaded by your carrier and anything you sync over during account creation will pull from that amount. The rest of that 16GB you can’t even see as the user — Android tells you that the phone only has 8.82GB total, entirely cutting out the space used by the system itself.

The Galaxy S4 is far from alone in this. The HTC One lists 7.14GB consumed in an ambiguously labeled “Other” category on the phone, but the phone at least confirms that it does in fact have 32GB of onboard storage. Because there’s no 16GB version of the HTC One, it’s not nearly as noticeable.

And, of course, there are plenty of ways around this for Samsung hopefuls. The phone offers a micro SD card slot that can expand storage by up to 64GB, and the phone itself comes in high capacity models if you are willing to spend the extra money. Just don’t expect to get anything close to 16GB from the entry-level S4.